Linea CL Series Camera
Camera Operation
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29
Off
Image is from the camera sensor.
Ramp
Image is filled horizontally with an image that goes from the
darkest possible value to the brightest.
Alternating
Alternating values. For 12-bit output, pixel values alternate
between 1381 (0x565) and 2746 (0xABA). For 8-bit output,
pixel values alternate between 86 (0x56) and 172 (0xAC).
Fixed Pattern
8 pixel cycling pattern. For 12-bit output, the pattern is
0x120|0x020|0x130|0x030|0x140|0x040|0x150|0x050. For
8-bit output, the pattern is
0x12|0x02|0x13|0x03|0x14|0x04|0x15|0x05.
Fixed Value
1381(86)
Fixed Grey Value. For 12-bit output: pixel value = 1381
(0x565). For 8-bit output: pixel value = 86 (0x56).
Fixed Value
32(2)
Fixed Grey Value. For 12-bit output: pixel value = 32 (0x20).
For 8-bit output: pixel value = 2 (0x2).
Related ASCII Commands
set video mode
Calibrating the Camera
Important Note: to ensure best results, the conditions under which you calibrate the
camera (for example, temperature and illumination) should be as close to the actual
operating conditions as possible.
The goal of calibration is for the camera to produce a uniform output image at a desired level while
imaging a uniform white object under conditions equal to the optical setup for the user’s
application. Flat field coefficients consist of an offset and gain for each pixel. These are the first
user corrections applied to the image. The flat field coefficients are saved and loaded with the user
set.
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Configure the camera to the required exsync and exposure timing, plus adjust the light level
for normal operation.
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Set the system gain to a value that best suits the application.
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The lens should be at the required magnification and aperture and be focused.
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As the white reference is located at the object plane, any markings or contaminants on its
surface (that is, dust, scratches, smudges) will end up in the calibration profile of the
camera. To avoid this, use a clean white plastic or ceramic material rather than trying to
rely on a paper reference. (Ideally, the white object will be moving during the calibration
process, as the averaging process of the camera will diminish the effects of any small
variation in the white reference.)
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Adjust the system gain until the peak intensity is at the desired DN level and then calibrate
the fixed pattern noise (FPN). Use a lens cap to ensure that no light reaches the sensor.
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Once complete, remove the lens cap and perform a photo response non-uniformity (PRNU)
calibration using the desired target value (in DN). You want all the pixels to match. This
target value should be higher than the peak values you saw while first setting up the
camera.